Self-draining separator bowl



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` SELF DRAINING SEPARATOR BOWL Filed sept. Y14,A 1932 z'sheets-sheet 1 Q Q O W Arm/P fr.:

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SELF DRAINING SEPARATOR BOWL Filed Sept. 14, 1952 V2 Sheets-Sheet 2 "Ml: J /7///// Patented June 23, 1936 UNITED STATES PATENT OFFICE SELF-DRAINING SEPARATOR BOWL Application September 14, 1932, Serial No. 633,034 In Sweden September 24, 1931 8 Claims. (Cl. 233-46) This invention relatesto bowlsffor centrifugal separators and has particular reference to the provision of a bowl which is selfdraining after rotation ceases.

The purication of liquids containing large proportions of both heavier and lighter solid matters is effected by means of centrifugal separators, the bowls of which are divided into concentric` annular chambers which are connected in series alternately at their tops and bottoms. After the separation is completed a certain amount of liquid remains in. the bowl which often, for instance in the purication of volatile scouring liquids, involves great inconvenience when the bowl is taken apart and cleaned.

Cleaning in such cases has been effected by blowing a jet of steam through the bowl but the apparatus required for this method is 4rather. complicated and inconvenient.

If the bowl is of the selfdraining type at present known, that is, a bowl from which the liquid is drained automatically after rotation hasy stopped, this inconvenience is in part avoided. However, in this arrangement, in whichv there are provided holes in the bottom of the bowl near to its axis of rotation,.drainage is effected only from the inner annular chambers, whereas the liquidA is left in the outer chambers.

In accordance with the present invention allr of the concentric annular chambers are connected through openings in the bottom of the bowl to discharge points adjacent the axis of rotation. These channels or openings are separate from each other in one form of the device so that the passages opening into certain chambers have no communication with other chambers but independently lead the drained liquid to the points of discharge.

In another. form of the invention particularly designed for use in connection with liquids containing large quantities of impurities which are lighter than the liquids, it is desirable to have the inner chambers empty into the outer ones through suitable openings while discharge from the outer chamber flows inwardly through suitable passages towards the axis of rotation adjacent which it is discharged.

The various objects of the invention relating particularly to details of construction will be 5o apparent from the following description read in conjunction with the accompanying drawings in which:

Fig. 1 is a vertical sectional view through one form of separator embodying the invention; 55 Fig. 2 is an enlarged vertical sectional View taken on a plane through the bowl at an angle withthe plane of the section of Fig. 1; and, l

Fig. 3 is a vertical sectional view showing a modified arrangement embodying the principles of the invention. 5V L Referring first to Figsl and 2, there is indicated at 2 the lower cup member of the bowl which is provided with a cover IIA of the usual type. Suitable annular partition walls separate'- the interior of the bowl into annular chambers l0 Ii, 8 and I0'. A conical partition member I2 separates the incoming liquid from the discharge for the heavier co-mponents. The iniiowing liquid enters at I4 and the heavier liquid is dischargedl at I6 during the operation of `the separator. Lol5.

cated in the bottom of the bowlis a disc I8 which is made separate so as to facilitate cleaning. A plurality of channels 20 are formed in the uppersurface of the disc I8 toVV provide communicationv between the chambers 8 and IIJl as indi- 20 cated in Fig. 2. Communication between chamy bers 6 and 8 is established through openings 22 located in the' lowerportion of the cylindrical wall between these chambers. In the lower sur-` face of the disc i8 are provided radially extending 25 channels 24 which provide passages between the chamber Ill and an annular opening 26 formed by a circular groove in the bottom of the disc I8; Discharge from the channel 26 takes place inwardly towards the axis of rotation throughY 30 one or more passages 28. lAn upwardly extending passage 30 furnishes an'auxiliary discharge from the lower portion of the annular chamber 6.

The bowl just described is particularly designed for use in connection with liquids containing great 35 quantities of impurities which are lighter than the liquid as,A for example. trichlorethylene. In the casefof this form of bowl the liquid from the chamber 6` drains into the chamber 8, the liquid then passing from the chamber 8 into the'outer 4.0 chamberV I 0i fromwhich itI flowsinwardlythrough the passages 24 to the discharge. By the use of this arrangement clogging is prevented. It is also found desirable to form the channels at 24 of small cross sectional area. The annular chan- 45 nel 26 forms an enlarged continuation of these restricted channels. In the arrangement'illustrated, a water outlet is provided at 3U. By the arrangement here adopted clogging of the water outlet is very effectively prevented.

It may be pointed out that in the arrangement illustrated, the flow of liquid is such that the inner chamber 6 does not receive any substantial amount of flow after being initially filled. That is, the flow takes place downwardly through the chamber 8 and then upwardly through I0, heavier liquid being discharged at I6.

In the embodiment of the invention illustrated in Fig. 3, the chambers are designated 32, 34, 36, 38, 40 and 42, being separated by cylindrical Walls through which alternate communication is provided as indicated at 45 and 48 through their bottoms and tops respectively. The walls extend between the top disc 43 which provides an outlet passage 44 between it and the cover of the bowl and a separate disc 50 which includes two separate series of channels 52 and 54, the former opening into the chambers 36 and 38 and the latter into the chambers 40 and 42 while not communicating at all with the chambers 36 and 38. 32 and 34 are in free communication With each other, the former being in direct communication with the discharge passage 56 which is located close to the axis of rotation. If the bowl has been stopped, the liquid contained in the various chambers will flow through the respective passages 52 and 54 into the innermost chamber from which discharge will take place at 56.

In both the modifications described the channels may be provided in the bowl bottom proper rather than in separate discs although the separate discs are preferred, inasmuch as cleaning is greatly facilitated by their removal. Any number of channels may of course be provided.

What I claim and desire to protect by Letters Patent is:

1. A separator bowl having a number of concentric chambers and means allowing discharge of separated constituents therefrom during centrifugation, two adjacent chambers having an opening at their lower ends affording means for the passage of material to be purified from one chamber to the other, the bottom part of the bowl having a drainage passage extending toward the axis of the bowl and communicating with one of said adjacent chambers and discharging nearer the axis of rotation than does any discharge for separated constituents, where- '1 by both of saidadjacent chambers are rendered self-draining.

2. A self-draining separator bowl having concentric annular chambers and means allowing discharge of separated constituents therefrom 'l and independent, substantially radial drainage passages leading from independent chambers toward the center of the bowl, and means insuring that all liquid flowing through said passages shall, before escaping, pass nearer to the center of the bowl than any discharge outlet for separated constituents.

3. A self-draining bowl having concentric annular chambers and means allowing discharge of separated constituents therefrom during centrifugation and means, independent of said discharge means, to drain all the chambers when the bowl comes to rest, including passages leading from certain chambers, and other passages, independent of the first named passages, leading from certain other chambers, toward the center of the bowl.

4. A self-draining separator bowl having concentric annular chambers and means allowing discharge of separated constituents from the bowl during centrifugation, and drainage passages in the bottom of the bowl into which the contents of all said chambers are adapted to drain, said drainage passages discharging nearer the axis of rotation than does any discharge for separated constituents so that said drainage passages are operative to drain only after the normal centrifugal separating operation of the bowl ceases.

5. A self-draining separator bowl having concentric annular chambers and means allowing discharge of separated constituents therefrom during centrifugation, and drainage passages in the bottom of the bowl communicating with all the chambers and discharging nearer the axis of rotation than does any discharge for separated constituents, the passages opening into certain chambers having no communication with other chambers.

6. A self-draining separator bowl having concentric annular chambers and means allowing discharge of separate constituents from the bowl during centrifugation, a separate lower disc in the bottom of the bowl having drainage passages communicating with said chambers and into which the contents of all said chambers are adapted to drain, said drainage passages discharging nearer the axis of rotation than does any discharge for separated constituents.

7. A self-draining separator bowl having concentric annular chambers and means allowing discharge of separated constituents therefrom during centrifugation, a drainage opening providing communication between an inner and an outer chamber, and a drainage passage opening into said outer chamber and discharging nearer the axis of rotation than does any discharge for separated constituents.

8. A separator bowl having a number of concentric chambers and means allowing discharge of separated constituents from the bowl during centrifugation, two adjacent chambers having an opening at their upper ends affording means for the passage of material from one chamber to the other and drainage passages, independent of said discharge means and opening, communicating with said chambers respectively and into which said chambers are adapted to respectively drain and which discharge nearer the axis of the bowl than does any discharge for separated constituents.

STIG BESKOW. 

